Question

specific mass conversions quick check
use this chemical equation to answer the question.
a + 2b → ab₂
the molar mass of a is 8 g/mol. the molar mass of b is 12 g/mol. which option shows the correct molar mass of ab₂?
20 g/mol
64 g/mol
32 g/mol
40 g/mol

Explanation:

Step1: <Molar mass of \(AB_2\) formula>

The molar mass of \(AB_2\) is \(M_{AB_2}=M_A + 2\times M_B\)

Step2: <Substitute values>

Given \(M_A = 8\space g/mol\) and \(M_B=12\space g/mol\), then \(M_{AB_2}=8 + 2\times12\)

Step3: <Calculate>

\(M_{AB_2}=8 + 24=32\space g/mol\)

Answer:

\(32\space g/mol\)